I was playing Heavy Rain once and my mom thought I was watching a movie.
Heavy Rain is the only game my wife ever asked me to play so she could see what happens next.
Well, I guess they were right when they said that Heavy Rain would catch the attention of women for it's aesthetics and drama.
The ironic thing with Heavy Rain is that it was released almost at the same time that Deadly Premonition did, and it started quite the discussion of what game was better for one game that promises a rich experience to the other one that looked like a Dreamcast game. In the end, Heavy Rain was just a successful experiment that generated a bunch of conflicted opinions and Deadly Premonition become a cult classic.
Either way, I do wonder if Quantic Dream has the ability to do an entire game as good as that tech demo though.